New polymers of carbonic acid. XXV. Photoreactive cholesteric polycarbonates derived from 2,5-bis(4?-hydroxybenzylidene)cyclopentanone and isosorbide

Abstract

Several binary copolycarbonates were prepared by polycondensation of 2,5‐bis(4‐hydroxybenzylidene)cyclopentanone, BHBC, with methylhydroquinone, MHQ, hydroquinone 4‐hydroxybenzoate, HQHB, or isosorbide. Furthermore, five ternary copolycarbonates were prepared based on the aforementioned monomers. All polycondensations were conducted in pyridine with trichloromethyl chloroformate as condensing agent. All polycarbonates were characterized by elemental analyses, viscosity and DSC measurements, IR and 1H‐ and 13C‐NMR spectroscopy, optical microscopy, and the WAXS powder pattern. All isosorbides containing binary and ternary copolycarbonates were found to form a cholesteric melt, but only three of them were capable to form a stable Grandjean texture upon shearing. © 1999 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 37: 1125–1133, 1999

Synthetic Polymers from Sugar-Based Monomers

“…96,97 Isosorbide and equimolar amounts of various diols were polycondensed with diphosgene in pyridine and different bisphenols using 1,3-bis(4-hydroxybenzyloxy)propane and 1,4-cyclohexanediol as comonomers. 98 The formation of large amounts of cyclic oligo-and polycarbonates was sometimes detected.…”

Synthesis and Characterization of an Efficient New Liquid Laser Dye Material - Chalcone (DMAPPP)

“…These chalcones had stimulated wide research interest owing to their unique structural feature, which has a carbonyl functional group in conjugation with carbon-carbon double bond, known as α, β-unsaturated keto group or enone function. This structural arrangement gives rise to numerous chemical, physical, photophysical and biological properties [1][2][3][4][5][6][7][8].…”

(Co‐)Polyesters Derived from Isosorbide and 1,4‐Cyclohexane Dicarboxylic Acid and Succinic Acid

“…Therefore, numerous studies were devoted to preparation and characterization of polyesters derived from isosorbide. [1][2][3][4][5][6][7][8][9][10] Polyesters prepared from isosorbide may be subdivided into two groups. First, fully aliphatic polyesters derived from nalkane a,v dicarboxylic acids and second, polyesters derived from aromatic dicarboxylic acids.…”